JPS60175631A - Building method for retaining wall - Google Patents

Abstract

PURPOSE:To safely build a retaining wall without excavating a bedrock, by a method wherein an H-steel is erected from a foundation along a bedrock, forms are supported and secured to the H-steel through support holding materials, and concrete is placed between the forms and the bedrock. CONSTITUTION:A foundation groove 11 is excavated in the lower part of the slanted face of slope of a bedrock A, and an H-steel 12, erected along the face of slope of the bedrock A, is disposed and concrete is placed to form a foundation 13. Forms 14 are located outside the H-steel 12, and the H-steel 12 and the forms 14 are secured by means of support holding materials 15. Concrete is poured between the bedrock A and the forms 14, and after the concrete is cured, the forms 14 are removed to build a retaining wall 16. This enables the H-steel to aid in first protection during construction and permits elimination of excavation of a face of slope.

Description

[Detailed Description of the Invention] ), This invention is aimed at preventing disasters such as landslides\
This article relates to a method of constructing a retaining wall.

In order to prevent disasters caused by landslides, retaining walls are used to protect the slopes of the ground, and the Lean Type 1 method is often adopted as a construction method for retaining walls.

There are two types of conventional leaning retaining wall construction methods: a single-sided formwork method by embedding ground anchors as shown in FIG. 1, and a double-sided formwork method by excavating extra moats as shown in FIG.

In the former single-sided formwork method, a rock anchor 1 is driven into the soft rock of the ground A, the formwork 3 is supported via the supporting material 2 connected to the anchor 1, and the concrete is placed between the formwork 3 and the ground A. The concrete is to be constructed with a diameter of 0 mm4.

However, such a single-sided formwork method requires soft rock to drive the anchor 1 into, and construction cannot be carried out in conditions with little soft rock, and there is a risk of collapse if the slope is high. It must have strength.

In addition, in the latter double-sided formwork method, after pre-excavating the ground A by an appropriate amount, the inner and outer formworks 6 are separated by separators 5.
7 was erected, and this formwork was supported by ground mass A via support 8, concrete was poured between both formworks to construct retaining wall 4, and formwork 6.7 was dismantled. After that, earth and sand is backfilled between the retaining wall 4 and the ground A.

This double-sided formwork method has the problem of poor work efficiency because it requires over-drilling work.

In addition, both methods have no safety elements for ordinary workers, so there are many personal injuries caused by landslides during work, and it is necessary to work as safely as possible against landslides. It is hoped that preventive measures will emerge.

Moreover, both types use other mountains to support the formwork, which can make construction difficult and difficult depending on the strata and geological conditions.
The disadvantage is that building a high retaining wall requires a longer construction period.

This invention was made in order to eliminate the above-mentioned drawbacks and problems, and provides a method for constructing a retaining wall that has high work safety, shortens the construction period, and reduces construction costs. The purpose is to provide.

The structure of this invention is to erect a molded steel into the foundation part of the retaining wall construction position, use this molded steel as a support G to erect the outer formwork, and pour concrete between the other pile and the formwork. A leaning-type retaining wall was constructed by burying the shaped steel.

Hereinafter, the present invention will be explained based on the embodiments shown in FIGS. 3 to 6 of the accompanying drawings.

First, create a groove at the bottom of the location where you want to build the retaining wall [this is the foundation groove 11].
As shown in Figure 4, the ground A is excavated from within this trench 11.
By arranging various types of steel, such as H-shaped steel 12, along the inclined slope O, and pouring concrete into the groove 11,
Build the foundation 13 and erect the H-shaped steel 12.

The above H-shaped steel 12'7 may be used depending on the height and thickness G of the retaining wall to be constructed, for example, the height is 630 mm.
When constructing a retaining wall of 0ffm, 198 x 99 mackerel and 20
H-beams with a cross-sectional shape of 0 x 100 Wff and 5 m in length are placed side by side at 1 m intervals.

Next, the outer formwork 14 of the 12 groups of H-beam steels is placed,
As shown in FIG. 5, each formwork 14 is
The outer formwork 14 that follows the slope of the ground A is assembled by fixing it to the ground.

After that, as shown in Fig. 6, fresh concrete is placed in the space formed between the outer formwork 14 and the ground A, and after the concrete solidifies, the formwork 14 is dismantled. As shown in the figure, a retaining wall 16 leaning against the slope of the ground A has been completed.

The H-shaped steel 12 is buried inside the retaining wall 16 and serves as a reinforcing material for the retaining wall 16.

In addition, the commercially available length of H-shaped steel 12 is 5 to 10 mm.
m+, so in order to construct a retaining wall 16 higher than this length, the above process should be the first step. After adding H-shaped steel by welding or bolting,
All you have to do is assemble the outer formwork and pour the second stage of concrete.

As shown in Fig. 5, in order to further improve safety during work, wire mesh 17 and wires are stretched on the slope of the ground A, and wire meshes 17 and wires are placed along the slope. A support member 18 may be interposed between the steel section 12 and the slope to facilitate the placement of the H section steel 12.

As described above, according to the present invention, since it has the above configuration, it has the following effects.

(1) First, we erected the shaped steel and used the shaped steel as a support to place concrete between the assembled formwork and the ground to construct a retaining wall. This provides the first level of protection, and can reduce anxiety about landslides, especially when working at the lower level, and in the event of an emergency, you can secure a place to evacuate by scraping or climbing over the shaped steel.

(2) Since the shaped steel is buried and Q-rubbed, a retaining wall with excellent load-bearing strength can be constructed.

(3) Since there is no need to excavate the slope of the ground, a retaining wall can be constructed regardless of the geology, such as weathered rock, hard rock, earth and sand.

(4) Since the formwork is assembled after the form steel is erected and concrete is poured between the formwork and the ground, fewer materials are used and construction efficiency is greatly improved.

By the way, for retaining walls of the same shape, the conventional one-sided formwork method by embedding ground anchors took 28 days, and the extra excavation method took 21 days, but with the construction method of this invention, it took only 1 day.
I was able to complete it in 3 days.

(5) By shortening the construction period, it is possible to reduce the labor force, and a significant cost reduction can be achieved.

[Brief explanation of drawings]

Figures 1 and 2 are vertical cross-sectional views showing different examples of conventional construction methods, Figure 3 is a vertical cross-sectional view of a retaining wall constructed using the construction method of the present invention, Figures 4, 5, and Figure 6 is a process diagram showing the construction order of the same as above. 12. H-shaped steel, 13. Foundation, 14..Outer formwork, 15.
...Shoring material, 16...Retaining wall patent applicant Tai 1) Shindo Agent Kama 1) Bun 2 Figure 1

Claims (1)

[Claims] A steel mold is built into the foundation at the location where the retaining wall is to be constructed, and this steel mold is passed through the support Q to assemble the outer formwork.Next, concrete is poured between the ground and the outer formwork, and the steel mold is assembled. A method for constructing a retaining wall characterized by forming a retaining wall in which the retaining wall is completely buried.